Sheet Feed Warm Air Control for Preventing Stack Sticking
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Solution Overview
Problem
Existing sheet feed apparatuses fail to adequately suppress sheet sticking due to factors beyond sheet type, humidity, and temperature, leading to feeding failures.
Innovation Solution
A sheet feed apparatus with an air blowing device and control system that adjusts warm air volume and temperature based on the amount of sheets, elapsed time, and humidity to prevent sticking, using a controller and sensors to determine optimal air blowing parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed warm air parameters are used regardless of sheet amount, then device complexity is reduced, but sheet feeding reliability deteriorates due to inadequate suppression of sheet sticking
Solution Approach 1:
The patent implements dynamic control of warm air parameters (temperature and volume) based on the detected sheet amount in the cassette. The control portion adjusts these parameters in real-time according to the number of sheets, transforming a static system into a dynamic one that adapts to varying conditions, thereby preventing sheet sticking without requiring overly complex control mechanisms.
Solution Approach 2:
The control portion changes the parameters of the warm air (temperature and volume) based on the sheet amount detected by the detection portion. By adjusting these physical parameters dynamically, the system optimizes sheet feeding reliability for different sheet quantities without adding significant complexity to the overall device structure.
2Reliability
If warm air blowing is continuously applied, then sheet sticking is suppressed, but energy consumption increases
Solution Approach 1:
The air blowing control portion operates the air blowing device periodically or intermittently based on detected sheet amount and feeding conditions, rather than continuously. This periodic operation maintains sheet feeding reliability by applying warm air only when necessary, thereby reducing unnecessary energy consumption while still preventing sheet sticking.
Solution Approach 2:
The system dynamically adjusts the temperature and volume parameters of the warm air based on sheet amount. By optimizing these parameters according to actual needs, the system maintains effective sheet separation while minimizing energy consumption, avoiding both excessive and insufficient warm air application.
3Reliability
If high temperature and high volume warm air are always used, then sheet sticking is effectively prevented, but sheet damage and energy waste increase
Solution Approach 1:
The control portion dynamically adjusts the temperature and volume parameters of the warm air based on the detected sheet amount. When fewer sheets are present, lower temperature and volume are sufficient, preventing sheet damage from excessive heat. When more sheets are present, higher temperature and volume are applied to prevent sticking, optimizing the balance between reliability and sheet protection.
Solution Approach 2:
The system applies warm air at appropriate levels rather than always using maximum intensity. By matching the warm air parameters to the actual sheet amount, the system avoids excessive action that would cause sheet damage, while still applying sufficient action to prevent sticking when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents sheet sticking and ensures smooth feeding by dynamically adjusting warm air conditions according to the loaded sheet amount, elapsed time, and humidity, thereby reducing feeding failures.
Implementation Method 1
A sheet feed apparatus blows warm air to a stack of sheets
Implementation Method 2
a heater that heats air sent from the air blowing fan to a predetermined temperature
Data Source
AI summary
A sheet feed apparatus includes a sheet feed cassette, an air blowing device, and an air blowing control portion. The air blowing device blows warm air to a sheet stack in the sheet feed cassette. The air blowing control portion controls the air blowing device to adjust an air volume and a temperature of the warm air. The air blowing control portion adjusts the air volume and the temperature of the warm air in accordance with the amount of sheets in the sheet feed cassette.